Glenn Greenwald on security and liberty

A critical, campaigning column on vital issues of civil rights, freedom of information and justice – and their enemies, from the award-winning journalist, former constitutional litigator and author of three New York Times bestsellers.

• NSA and GCHQ unlock encryption used to protect emails, banking and medical records• $250m-a-year US program works covertly with tech companies to insert weaknesses into products• Security experts say programs 'undermine the fabric of the internet'